package facadePattern;

/**
 * @author： pang-yun
 * @date： 2021-12-27 15:55
 * 功能目的 ：用于
 */

public class Screen {
    public Screen() {
    }

    private static Screen instance = new Screen();

    private static Screen getInstance() {
        return instance;
    }

    public void up(){
        System.out.println("Screen up");
    }

    public void down(){
        System.out.println("Screen down");
    }

}
